To fix Msdmo.dll Error completely from operating system at first it is important to know the exact reason of error for this at first check the drivers that are used in the Windows operating system if it old then it will not be compatible with other applications that are used in PC. So to resolve this situation you are required to update the driver to latest version. In case problem is not solved then you will have to check the registry as it is the core of operating system and any problem, corruption or damage will affect entire PC and results in error message. So you can use Registry repair tool to fix the registry related problem and to use it you can simply download it. For more information: http://www.msdmodllerrorfix.com